I would like to see this as well. You figured they would have built into Windows by now... If you are willing to spend for that feature take a look at zabkat.com/x2facts.htm
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snmcdonaldFeb 5 '11 at 22:40

It's not builtin, because all the current methods are not only inaccurate, but they are also IO intensive, considering it is a task users rarely use. Best left up to third party programs.
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surfasbNov 24 '11 at 1:59

3 Answers
3

I use FolderSize on a server at work to administrate more effectively. It's essentially a Windows Explorer plugin that allows you to display folder-children, both files and folders along with their size.

This isn't possible using the default Windows Explorer, you would need some sort of plugin that aggregates this information (or check them manually). You can, however, get this information from a Command Shell (albeit not in a pretty way) via "dir /S". Run "dir /?" for other options. For example: